pycryptojs 1.0.0

pycryptodome + CryptoJS-compatible Rijndael for non-standard key sizes

pycryptojs

pycryptodome + CryptoJS-compatible Rijndael for non-standard key sizes.

Install

pip install -e .

What it does

pycryptojs is a drop-in replacement for pycryptodome (Crypto.*) that adds one extra capability:
AES with non-standard key sizes (e.g. 64 bytes), matching the behavior of CryptoJS when enc.Utf8.parse() produces an oversized key.

Under the hood, CryptoJS follows the Rijndael spec for arbitrary key sizes:

• 64-byte key → 22 rounds (vs standard AES-256's 14 rounds)
• pycryptodome rejects these keys; pycryptojs handles them transparently.

Usage

Standard AES — identical to pycryptodome

from pycryptojs.Cipher import AES
from pycryptojs.Util.Padding import pad, unpad

key = b'0123456789abcdef'  # 16, 24, or 32 bytes → pycryptodome handles it
iv  = b'abcdef0123456789'

cipher = AES.new(key, AES.MODE_CBC, iv=iv)
ct = cipher.encrypt(pad(b'hello world', 16))

Non-standard key (e.g. 64 bytes) — Rijndael engine, ECB only

from pycryptojs.Cipher import AES
from pycryptojs.Util.Padding import pad, unpad

key = b'1593cc0b7cd7651ad8a17bc528986046fa3e6e709f6405274b17def26c7faa6r'  # 64 bytes

cipher = AES.new(key, AES.MODE_ECB)
ct = cipher.encrypt(pad(b'0lrtwyvqdaj657hq4t6m', 16))
# decrypt
pt = unpad(cipher.decrypt(ct), 16)

Standalone helpers (base64 in/out, PKCS7 handled internally)

from pycryptojs import rijndael_ecb_encrypt, rijndael_ecb_decrypt

KEY = b'1593cc0b7cd7651ad8a17bc528986046fa3e6e709f6405274b17def26c7faa6r'

enc = rijndael_ecb_encrypt("0lrtwyvqdaj657hq4t6m", KEY)
# → "j7ywbgh7VYbTwxvei9CaRL0rNVQW7zlzeJNd+SRxUjI="

dec = rijndael_ecb_decrypt(enc, KEY)
# → "0lrtwyvqdaj657hq4t6m"

Everything else — same as pycryptodome

from pycryptojs.Hash import SHA256
from pycryptojs.PublicKey import RSA
from pycryptojs.Util.Padding import pad, unpad
from pycryptojs.Random import get_random_bytes